LinHT-hw

Open-source hardware, Linux-based, SDR handheld transceiver. OpenHT successor with greatly simplified hardware - no FPGAs involved. This project offers a replacement board for the Retevis C62 radio, greatly expanding its capabilities.

Hardware

The device uses an MCM-iMX93 System on Module (SoM) running Linux. The RF front-end is based on the Semtech SX1255. The chip is used as a complete IQ modulator/demodulator, allowing for true all-mode support.

Resources

CPU:

Dual-core ARM Cortex-A55 @ 1.7GHz
ARM Cortex-M33 coprocessor @ 250MHz
Floating Point Unit
ARM Ethos U-65 microNPU (Neural Processing Unit with Tensor Flow Lite support)

Memory:

2GB LPDDR4
32GB eMMC

RF:

500kHz bandwidth complete IQ transceiver

Software

Developers can use C/C++/Python as well as (or in conjunction with) GNU Radio flowgraphs. Tools such as gcc are built-in. The experimental Linux image is available here.

Supported modes (so far):

FM transmission and reception with pre-/de-emphasis and CTCSS,
SSB transmission and reception,
M17 - transmission and reception,
TETRA - reception only,
Demo 64QAM transmission at 2Mbps

Other modes can be added later (FreeDV, APRS, etc.).

License

This work is licensed under a Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International License.

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